DS1086LU-527+ Maxim Integrated, DS1086LU-527+ Datasheet - Page 13

• Manufacturer Part Number: DS1086LU-527+
• Description: Programmable Oscillators 3.3V Spread-Spectrum EconOscillator
• Manufacturer: Maxim Integrated
• Series: DS1086r

Specifications of DS1086LU-527+

• Rohs: yes
• Package / Case: uMax-8
• Frequency: 130 KHz to 66.6 MHz
• Supply Voltage: 3.3 V
• Load Capacitance: 50 pF
• Termination Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Maximum Operating Temperature: + 85 C
• Dimensions: 3 mm W x 3 mm L x 0.85 mm H
• Mounting Style: SMD/SMT
• Product: Programmable
• Supply Voltage - Max: 2.7 V
• Supply Voltage - Min: 3.6 V
• Part # Aliases: 90-1L86U+527

The expected output frequency is not exactly equal to the
desired frequency of 11.0592MHz. The difference is
450Hz. In terms of percentage, Equation 6 shows that the
expected error is 0.004%. The expected error assumes
typical values and does not include deviations from the
typical as specified in the electrical tables.
Example #2: Calculate the register values needed to
generate a desired output frequency of 50MHz.
Since the desired frequency is already within the valid
master oscillator frequency range, the prescaler is set
to divide by 1, and hence, PRESCALER = 0000h
(currently ignoring the other setting).
Next, looking at Table 2, OS + 1 provides a range of
frequencies centered around the desired frequency. To
determine what value to write to the OFFSET register,
the RANGE register must first be read. Assuming 12h
was read in this example, 13h (OS + 1) is written to the
OFFSET register.
Figure 4. 2-Wire Data Transfer Protocol
Maxim Integrated
%
ERROR
f
MASTER OSCILLATOR
%ERROR
EXPECTED
SDA
SCL
CONDITION
START
EXPECTED
=
11 0592
.
=
=
MSB
11 0592
3.3V Spread-Spectrum EconOscillator
f
DESIRED
= 50.0MHz x 2
1
11 0592
MHz
.
450
.
Hz
f
−
DESIR
MHz
2
11 05 5 875
SLAVE ADDRESS
−
MHz
.
f
EXPECTED
E E D
×
100 0 004
0
MHz
= 50.0MHz
=
6
.
×
×
100
100
%
7
DIRECTION
R/W
BIT
8
SIGNAL FROM RECEIVER
(6)
(7)
ACKNOWLEDGEMENT
ACK
9
Finally, the DAC value is calculated as shown in
Equation 8.
The result is then converted to hex (0118h) and then
left-shifted, resulting in 4600h to be programmed into
the DAC register.
In summary, the DS1086L is programmed as follows:
PRESCALER = 0000h
OFFSET = OS + 1 or 13h (if RANGE was read as 12h)
DAC = 4600h
Since the expected output frequency is equal to the
desired frequency, the calculated error is 0%.
DAC VALUE
1
f
OUTPUT
2
REPEATED IF MORE BYTES
=
ARE TRANSFERRED
(
50 0
=
5
3–7
.
(
48 6
kHz STEP SI
MHz
.
SIGNAL FROM RECEIVER
ACKNOWLEDGEMENT
MHz
−
50 0
8
48 6
) (
.
+
1
.
M M Hz
2
0
Z Z E
MHz
280
ACK
9
=
)
×
50 0 .
= 280 00
5
DS1086L
kHz
MHz
.
)
=
OR REPEATED
CONDITION
CONDITION
(
START
decimal
STOP
)
(8)
(9)
13